JP6259932B2 - Fireproof joinery - Google Patents

Description

(Cross-reference of related applications)
This application claims the priority based on Japanese Patent Application No. 2015-209115 for which it applied on October 23, 2015 (the whole indication is used in this specification by reference).
(Technical field)
The present invention relates to a thermally expandable refractory material, joinery frame and joinery used for an opening of a structure such as a house, and more specifically, a thermally expandable refractory material constituting a frame such as various sash windows or doors, The present invention relates to a joinery frame and joinery.

  One of the performances required for fittings such as windows, shojis, doors (ie doors), doors, brans, and balustrades used in the openings of structures such as houses is to improve fire performance. It has been practiced to install a thermally expandable refractory material on the joinery. Conventionally, a thermally expansible material is attached to the frame body so that the flame does not penetrate through the frame body of the joinery installed in the opening of the structure. For example, Patent Literature 1 describes a fireproof resin sash in which a thermally expandable refractory material is inserted into a plurality of cavities inside an opening frame of a fireproof resin sash.

Japanese Patent No. 4691324

  In the conventional sash structure described in Patent Document 1, the heat-expandable refractory material is arranged in direct contact with a frame body such as a sash or a door. For this reason, when the joinery is made of metal, particularly aluminum, the joinery may be corroded by the acid component of the thermally expandable graphite in the thermally expandable material.

  An object of the present invention is to provide a thermally expandable refractory material, a joinery frame, and a joinery that prevent corrosion of the joinery due to an acid component of thermally expanded graphite.

  In order to achieve the above object, the inventors of the present invention solve the above problems by reducing the area where the thermally expandable layer containing the thermally expandable graphite of the thermally expandable refractory material contacts the frame as much as possible. The present invention has been completed by arranging a substantial part of the thermally expandable layer at a distance from the frame of the joinery.

  According to one aspect of the present invention, there is a joinery frame, the joinery frame including a frame provided with a groove, and a thermally expandable refractory material fitted in the groove of the frame, The heat-expandable refractory material includes a heat-expandable layer containing heat-expandable graphite and a non-expandable layer provided on one surface side of the heat-expandable layer, and the heat-expandable layer in the non-expandable layer A fitting frame body is provided, wherein a protrusion is provided on a surface opposite to the surface on which the protrusion is provided or a substantially vertical surface, and the protrusion is fitted in a groove of the frame. .

  According to another aspect of the present invention, it is a joinery frame, and the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove of the frame, The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, the thermally expandable refractory material is provided with a protruding portion, the protruding portion is formed in the groove of the frame body, and the thermally expanded layer and There is provided a joinery frame that is fitted so as to be separated from the frame.

  According to another aspect of the present invention, it is a joinery frame, wherein the joinery frame includes a frame provided with a groove and a thermally expandable refractory material fitted in the groove, and the thermal expansion. The refractory material includes a thermally expandable layer containing thermally expandable graphite, a protrusion is provided on a side surface in the width direction of the thermally expandable layer, and the protrusion is fitted in a groove of the frame. A feature joinery frame is provided.

  According to another aspect of the present invention, it is a joinery frame, wherein the joinery frame includes a frame provided with a groove and a thermally expandable refractory material fitted in the groove, and the thermal expansion. The refractory refractory material includes a thermally expandable layer containing thermally expandable graphite and a non-expandable layer, and the non-expandable layer is provided with a protrusion that protrudes toward the thermally expandable layer, and the protrusion is the frame. There is provided a joinery frame body, wherein the thermal expansion layer and the frame body are fitted into a groove of the body so as to be separated from each other.

  According to another aspect of the present invention, there is a joinery having an opening frame having an opening, a plate material that closes the opening of the opening frame, and an outer frame that supports the outer periphery of the plate. There is provided a joinery characterized in that at least one of the opening frame and the outer peripheral frame includes the joinery frame described in any one of the above.

  According to another aspect of the present invention, the heat-expandable layer including the heat-expandable graphite, and a non-expandable layer provided on one surface side of the heat-expandable layer, the heat in the non-expandable layer There is provided a thermally expandable refractory material characterized in that protrusions are provided on the surface opposite to the surface on which the expandable layer is provided or on a substantially vertical surface.

  According to another aspect of the present invention, there is provided a thermally expandable refractory material for fitting into a frame provided with a groove, the thermally expandable refractory material comprising a thermally expandable layer containing thermally expandable graphite. The thermally expandable refractory material is provided with a protrusion, and the protrusion has a length when the thermally expandable refractory material is fitted into a groove of the frame, A heat-expandable refractory material characterized in that it has a length separating the frame body is provided.

  According to another aspect of the present invention, the heat-expandable layer comprising heat-expandable graphite and a non-expandable layer provided on one side of the heat-expandable layer, the non-expandable layer includes the above-mentioned There is provided a thermally expandable refractory material characterized in that a projecting portion projecting to the thermally expandable layer side is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while giving favorable fire prevention performance to joinery, corrosion of the joinery by thermally expansible graphite can be prevented.

1 is a schematic perspective view of a thermally expandable refractory material according to a first embodiment of the present invention. The fragmentary sectional view which shows the state which mounted | wore the frame body of the sash with the thermally expansible fireproof material of FIG. Sectional drawing which shows another example of a thermally expansible refractory material. The schematic perspective view of the thermally expansible fireproof material which concerns on 2nd Embodiment of this invention. Sectional drawing which shows another example of a thermally expansible refractory material. Sectional drawing which shows another example of a thermally expansible refractory material. Sectional drawing which shows another example of a thermally expansible refractory material. The schematic perspective view of the thermally expansible refractory material which concerns on 3rd Embodiment of this invention. The schematic perspective view of the thermally expansible refractory material which concerns on 4th Embodiment of this invention. The front view of a window. FIG. 11 is an essential part cross-sectional view taken along line AA in FIG. 10. The front view of a door. FIG. 13 is a cross-sectional view taken along line BB in FIG. 12.

  In this specification, “building” includes structures such as single-family houses, apartment houses, high-rise houses, high-rise buildings, commercial facilities, public facilities, etc., passenger ships, transport ships, ferry ships, etc. However, it is not limited to these.

  In the present invention, “joint” includes, but is not limited to, windows (including sliding windows, open windows, raising / lowering windows, etc.), shojis, doors (that is, doors), doors, brans, and balustrades.

(First embodiment)
A thermally expandable refractory material according to a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the heat-expandable refractory material 1 disposed on the joinery frame includes a heat-expandable layer 2 containing heat-expandable graphite and a non-expandable layer 3. A coating layer 4 is laminated on the surface of the thermally expandable layer 2 opposite to the non-expandable layer 3. The heat-expandable layer 2, the non-expandable layer 3 and the coating layer 4 are integrally formed into a sheet shape. Further, a protrusion 5 is provided on the surface of the non-expandable layer 3 opposite to the surface on which the heat-expandable layer 2 is provided, and a base portion 5a protruding from the non-expandable layer 3 and a tip portion on the front end side of the base portion 5a. In this embodiment, the maximum width W ₂ of the tip 5b is larger than the maximum width W ₁ of the base 5a. The shape of the distal end portion 5b is not particularly limited, but for example, as shown in the figure, it may take a shape that has a substantially triangular cross section and tapers toward the distal end. As will be described later, the protrusion 5 has a shape that fits into the groove of the frame of the joinery.

  The thermally expandable layer 2 is a resin composition that includes thermally expandable graphite and an inorganic filler in a resin component.

  As the resin component, known resin components can be widely used, and examples thereof include thermoplastic resins, thermosetting resins, rubber substances, and combinations thereof.

  Examples of the thermoplastic resin include polypropylene resins, polyethylene resins, poly (1-) butene resins, polypentene resins and other polyolefin resins, polystyrene resins, acrylonitrile-butadiene-styrene (ABS) resins, polycarbonate resins, polyphenylene ether resins, ( Examples thereof include synthetic resins such as (meth) acrylic resins, polyamide resins, polyvinyl chloride resins, novolac resins, polyurethane resins, and polyisobutylenes.

  Examples of the thermosetting resin include synthetic resins such as polyurethane, polyisocyanate, polyisocyanurate, phenol resin, epoxy resin, urea resin, melamine resin, unsaturated polyester resin, and polyimide.

  Rubber materials include natural rubber, isoprene rubber, butadiene rubber, 1,2-polybutadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, chlorinated butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, acrylic rubber And rubber materials such as epichlorohydrin rubber, polyvulcanized rubber, non-vulcanized rubber, silicone rubber, fluorine rubber, and urethane rubber.

  These synthetic resins and / or rubber substances can be used singly or in combination.

  Among these synthetic resins and / or rubber substances, those which are flexible and have rubber-like properties are preferred. The resin component having such properties can be highly filled with an inorganic filler, and the resulting resin composition is flexible and easy to handle. In order to obtain a resin composition that is more flexible and easy to handle, a non-vulcanized rubber such as butyl and a polyethylene resin are preferably used.

  Instead, an epoxy resin is preferable from the viewpoint of improving the fire resistance by increasing the flame retardancy of the resin itself.

  Thermally expandable graphite is a conventionally known substance, and powders such as natural scaly graphite, pyrolytic graphite, and quiche graphite are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid, and concentrated nitric acid, perchloric acid, and perchlorine. A graphite intercalation compound is produced by treatment with strong oxidants such as acid salts, permanganates, dichromates, dichromates, hydrogen peroxide, etc., while maintaining the layered structure of carbon It is a kind of crystalline compound.

  The thermally expandable graphite obtained by the above acid treatment may be further neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound, or the like. Examples of commercially available products of thermally expandable graphite include “GREP-EG” manufactured by Tosoh Corporation, “GRAFGUARD” manufactured by GRAFTECH, and the like.

  When the expanded heat insulating layer is formed, the inorganic filler increases the heat capacity and suppresses heat transfer, and works as an aggregate to improve the strength of the expanded heat insulating layer. The inorganic filler is not particularly limited, and examples thereof include metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrite; calcium hydroxide, magnesium hydroxide, Water-containing inorganic substances such as aluminum hydroxide and hydrotalcite; metal carbonates such as basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, barium carbonate and the like.

  In addition to these, inorganic fillers include calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dosonite, barium sulfate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite. , Imogolite, sericite, glass fiber, glass beads, silica balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, Examples include lead zirconate titanate, zinc stearate, calcium stearate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, and dewatered sludge. These inorganic fillers can be used alone or in combination of two or more.

  The resin composition contains 10 to 350 parts by weight of the thermally expandable graphite and 30 to 400 parts by weight of the inorganic filler with respect to 100 parts by weight of the resin component such as the thermoplastic resin and epoxy resin. Is preferred.

  The total of the thermally expandable graphite and the inorganic filler is preferably in the range of 50 to 600 parts by weight with respect to 100 parts by weight of the resin component.

  Such a resin composition expands by heating to form a refractory heat insulating layer. According to this composition, the thermally expandable refractory material expands by heating such as a fire, and can obtain a necessary volume expansion coefficient. After expansion, a residue having a predetermined heat insulation performance and a predetermined strength is formed. It is also possible to achieve stable fireproof performance.

  The resin composition constituting the heat-expandable refractory material is added to each of the above components in order to increase the strength of the expansion heat insulation layer and improve the fireproof performance, as necessary, within a range not impairing the object of the present invention. In addition, red phosphorus; various phosphate esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate; sodium phosphate, potassium phosphate, magnesium phosphate, etc. Phosphorus metal salt; Ammonium polyphosphate; Phosphorus compounds such as a compound represented by the following chemical formula (1) can be included.

In the chemical formula (1), R ¹ and R ³ are the same or different and each represents hydrogen, a linear or branched alkyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms. R ² is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, a linear or branched alkoxyl group having 1 to 16 carbon atoms, an aryl group having 6 to 16 carbon atoms, or carbon. The aryloxy group of Formula 6-16 is shown.

  Further, the resin composition constituting the heat-expandable refractory material is a range that does not impair the object of the present invention, and if necessary, in addition to antioxidants such as phenol-based, amine-based, sulfur-based, etc., metal damage inhibitor , Additives such as antistatic agents, stabilizers, crosslinking agents, lubricants, softeners, pigments, tackifying resins, molding aids, and tackifiers such as polybutenes and petroleum resins.

  The heat-expandable refractory material is also available as a commercial product. For example, a fire barrier manufactured by Sumitomo 3M Limited (a heat-expandable refractory material composed of a resin composition containing chloroprene rubber and vermiculite, expansion ratio: 3 times, Thermal conductivity: 0.20 kcal / m · h · ° C., Mitsuji Metal Paint Co., Ltd., medium-cut (thermally expandable refractory material comprising a resin composition containing polyurethane resin and thermally expandable graphite, expansion coefficient: 4 times, Thermal conductivity: 0.21 kcal / m · h · ° C.), and thermally expandable refractory materials such as Sekisui Chemical Co., Ltd. Fibrok.

  The material constituting the non-intumescent layer 3 may be, for example, a metal, a non-intumescent resin, or a composite material thereof. The non-intumescent resin is composed of a thermoplastic resin, a thermosetting resin, an elastomer, a rubber, or a combination thereof. Examples of the thermoplastic resin include a fluororesin, a polyphenylene ether, a modified polyphenylene ether, a polyphenylene sulfide, a polycarbonate, Polyetherimide, polyether ether ketone, polyarylate, polyamide, polyamideimide, polybutadiene, polyimide, acrylic resin, polyacetal, polyamide, polyethylene, polyethylene terephthalate, polycarbonate, polyester, polystyrene, polyphenylene sulfide, polybutylene terephthalate, polypropylene, polychlorinated Vinyl, ABS resin, AS resin, etc. are mentioned. Examples of thermosetting resins are epoxy resin, phenol resin, melamine Resin, urea resin, unsaturated polyester resin, alkyd resin, polyurethane, thermosetting polyimide, etc. Examples of elastomers include olefin elastomers, styrene elastomers, ester elastomers, amide elastomers, and vinyl chloride elastomers. Examples of rubber include natural rubber, silicone rubber, styrene / butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, acrylonitrile / butadiene rubber, nitrile butadiene rubber, butyl rubber, ethylene / propylene rubber, ethylene -Propylene / diene rubber, urethane rubber, silicone rubber, fluorine rubber, and the like. Non-thermally expandable refractory materials, as long as the physical properties are not impaired, phenolic, amine-based, sulfur-based antioxidants, metal damage inhibitors, antistatic agents, stabilizers, crosslinking agents, lubricants, softening Agents, pigments and the like may be added. Moreover, a general flame retardant may be added and fire prevention performance can be improved by the combustion suppression effect by a flame retardant.

  The coating layer 4 may be made of any material that allows the thermal expansion layer 2 to expand due to heating, and may be a combustible material or a nonflammable material. When the coating layer 4 is a combustible material, the thermal expansion material 2 is more easily expanded, and a predetermined fire resistance performance is favorably expressed.

  Although the flammable material is not particularly limited, it is preferable to use a thermoplastic resin, an elastomer, a rubber, or a combination thereof. Examples of the thermoplastic resin include a fluororesin, a polyphenylene ether, a modified polyphenylene ether, a polyphenylene sulfide, Polycarbonate, polyetherimide, polyetheretherketone, polyarylate, polyamide, polyamideimide, polybutadiene, polyimide, acrylic resin, polyacetal, polyamide, polyethylene, polyethylene terephthalate, polycarbonate, polyester, polystyrene, polyphenylene sulfide, polybutylene terephthalate, polypropylene, Examples include elastomers such as polyvinyl chloride, ABS resin, and AS resin. -Styrene elastomers, ester elastomers, amide elastomers, vinyl chloride elastomers, etc. Examples of rubbers include natural rubber, silicone rubber, styrene-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene. Examples thereof include rubber, acrylonitrile / butadiene rubber, nitrile butadiene rubber, butyl rubber, ethylene / propylene rubber, ethylene / propylene / diene rubber, urethane rubber, silicone rubber, and fluorine rubber. Although the thickness of the coating layer 4 which consists of a thermoplastic resin, an elastomer, rubber | gum, or these combinations is not specifically limited, Usually, it is 0.5-6 mm.

  Moreover, the coating layer 4 may be comprised from the combination of a metal, a metal alloy, or a metal and said combustible material.

  The appearance of the coating layer 4 may be arbitrary, and the color and pattern can be determined according to the purpose. In one embodiment, the color of the coating layer 4 is similar to that of the frame 7 of the joinery to which the thermally expandable refractory material 1 is attached. For example, when the heat-expandable refractory material 1 is attached to an aluminum window frame, the color of the coating layer 4 can also be aluminum. Similar colors mean three elements represented by color characteristics, that is, hues that are the same or close to each other among hue, brightness, and saturation. Specifically, warm colors, cold colors, white and milky white, transparent and translucent, etc. can be defined as similar colors. The covering layer 4 can be given a design by giving an arbitrary pattern such as visually producing warmth as a wood grain. Thus, it is possible to improve the black-gray design by coating the thermally expandable layer 2 with the coating layer 4. Furthermore, by covering with the coating layer 4, the weather resistance of the thermally expandable material 2 is improved, and the long-term durability of the thermally expandable refractory material 1 is also improved.

  Although the manufacturing method of the heat-expandable refractory material 1 is not particularly limited, the heat-expandable layer 2, the non-expandable layer 3, and the coating layer 4 may be co-extruded, or an adhesive means such as an adhesive sheet or an adhesive. May be integrally coupled to each other, or may be integrally coupled by physical fixation.

  The molded body of the resin composition constituting the heat-expandable refractory material is prepared by preparing a kneaded product of the resin composition and then molding, thereby forming a molded body that matches the shape and size of the cavity, or a sheet or roll. It can be obtained by producing a shaped product and then cutting it.

  In the case of a kneaded product of the resin composition, each of the above-mentioned components is an extruder, a hanbury mixer, a kneader mixer, a kneading roll, etc., and in the case of a thermosetting resin such as an epoxy resin, a reika machine, a planetary stirrer, etc. It can be obtained by using a known kneading apparatus. In the case of a two-component thermosetting resin, particularly an epoxy resin, a kneaded mixture of each of the two components and the filler is prepared separately by the kneading method, and is used with a plunger pump, a snake pump, a gear pump, etc. Each kneaded product may be supplied and mixed with a static mixer, a dynamic mixer or the like to produce a kneaded product.

  As a molding method of the resin composition, the kneaded material can be molded using a known method such as press molding, calender molding, extrusion molding, injection molding, or the like. In addition, as a method for molding a two-component thermosetting resin, particularly an epoxy resin, a known method may be used depending on the shape as appropriate, such as roll molding with SMC (Sheet Molding Compound) or the like, or coater molding with a roll coater or blade coater. Can be used.

  Although the thickness of the molded body of the resin composition is not limited, it is preferably 0.1 to 6 mm. When the thickness is 0.1 mm or more, sufficient fireproof performance can be exhibited by the thickness of the expanded heat insulating layer formed by heating. Moreover, if it is 6 mm or less, the insertion into a cavity may be easy.

  FIG. 2 shows a state in which the thermally expandable refractory material 1 of FIG. 1 is mounted on a window sash or door sash frame 7 as a fitting. In this embodiment, the thermally expandable refractory material 1 is disposed along a space extending along the longitudinal direction inside the frame body 7. The frame 7 may be made of any material such as metal, resin, wood, or a composite material thereof, but is preferably made of metal. A pair of opposed rail-like ridges 7a and 7b extending along the longitudinal direction of the frame 7 is provided at the upper end of the frame 7, and the two ridges 7a form a groove 8a between them. Two ridges 7b form a groove 8b therebetween. The two protrusions 5 of the thermally expandable refractory material 1 are fitted in the grooves 8a and 8b, respectively. The heat-expandable refractory material 1 may be pressed into the frame body 7 by applying pressure from above so that the protruding portion 5 fits into the grooves 8a and 8b, or the protruding portion from the end of the frame body 7 5 may be inserted and fitted along the longitudinal direction of the groove. A space 8c is formed between the thermally expandable refractory material 1, the raised portion 7a, and the raised portion 7b, and the portion of the thermally expandable refractory material 1 that contacts the space 8c is in contact with the thermally expandable refractory material 1 and the frame body 7. Is prevented.

  According to the configuration of the first embodiment, the heat-expandable refractory material 1 is in contact with the frame body 7 at the non-expandable layer 3 (specifically, a part of the main body of the non-expandable layer 3 and the protruding portion 5). The thermally expandable layer 2 is separated from the frame body 7 via the non-expandable layer 3 and is not in direct contact with the frame body 7. For this reason, it can prevent that the acid in the thermally expansible layer 2 transfers to the frame 7, and corrodes the metal of the frame 7.

  The heat-expandable refractory material 1 of the first embodiment is not limited to the configuration described above, and can be modified as follows.

  As shown in FIG. 3, the heat-expandable refractory material 1 may be composed of a heat-expandable layer 2 and a non-expandable layer 3 containing heat-expandable graphite, and the coating layer 4 may be omitted.

The shape of the protrusion 5 is not limited, and may be a substantially circular cross section, a substantially elliptical shape, a substantially rectangular shape, or the like. The maximum width W ₂ of the tip portion 5b may be smaller than or equal to the maximum width W ₁ of the base portion 5a.

  The number of the protrusions 5 is not limited, and may be one or may be three, four, five, or the like. Moreover, when providing the some protrusion part 5, each protrusion part 5 may be the same shape, and a different shape may be sufficient as it.

  The grooves 8a and 8b of the frame 7 are provided between the one raised portion 7a or 7b and the portion of the frame 7 that is not the raised portion, in addition to being provided between the two raised portions 7a and 7b. May be.

(Second Embodiment)
Next, a thermally expandable refractory material according to a second embodiment of the present invention will be described with reference to FIG. In order to simplify the description, description of the same member numbers as in the first embodiment will be omitted.

  As shown in FIG. 4, the heat-expandable refractory material 1 disposed in the joinery frame includes a heat-expandable layer 2 containing a heat-expandable graphite and a coating layer 4. The heat-expandable layer 2 and the coating layer 4 are integrally formed in a sheet shape. In addition, a protruding portion 5 is provided on the surface of the thermally expandable layer 2 opposite to the surface on which the coating layer 4 is provided, and a base portion 5a protruding from the thermally expandable layer 2 and a tip portion on the tip side of the base portion 5a. 5b. The protrusion 5 is made of the same material as the thermally expandable layer 2.

  The materials constituting the expandable layer 2 and the covering layer 4, the materials constituting the base portion 5a and the tip portion 5b, and the dimensions thereof are as described in the first embodiment.

  The heat-expandable refractory material 1 of the second embodiment can be manufactured by coextrusion molding or the like, similar to that described for the heat-expandable refractory material 1 of the first embodiment.

In the thermally expandable refractory material 1 according to the second embodiment, the length L of the protrusion 5 is larger than the depth D _ep of the corresponding groove 8 a that fits with the protrusion 5 in the frame 7. For this reason, in the thermally expandable refractory material 1, the portion of the main body of the thermally expandable refractory material 1 that extends in the longitudinal direction of the thermally expandable refractory material 1 other than the protruding portion 5 is separated from the frame body 7, and 2 is not in direct contact with the frame body 7 at a portion other than the tip of the protruding portion 5. For this reason, it can prevent that the acid in the thermally expansible layer 2 transfers to the frame 7, and corrodes the metal of the frame 7.

  The thermally expandable refractory material 1 of the second embodiment is not limited to the configuration described above, and can be modified as follows.

  As shown in FIG. 5, the heat-expandable refractory material 1 may be composed of a heat-expandable layer 2 containing heat-expandable graphite, and the coating layer 4 may be omitted.

  As shown in FIG. 6, the thermally expandable refractory material 1 of the second embodiment is similar to that shown for the thermally expandable refractory material 1 of the first embodiment of FIG. It is good also as a structure by which the layer 2 and the coating layer 4 were laminated | stacked in this order. In this case, the protrusion 5 is formed of the same material as the non-expandable layer 3, and the non-expandable layer 3 is not in direct contact with the frame body 7 at a place other than the tip of the protrusion 5. It is possible to prevent the acid from moving to the frame body 7 and corroding the metal of the frame body 7.

  As shown in FIG. 7, the coating layer 4 may be omitted from the embodiment of FIG.

The shape of the protrusion 5 is not limited, and may be a substantially circular cross section, a substantially elliptical shape, a substantially rectangular shape, or the like. The maximum width W ₂ of the tip portion 5b may be smaller than or equal to the maximum width W ₁ of the base portion 5a.

  The number of the protrusions 5 is not limited, and may be one or may be three, four, five, or the like. Moreover, when providing the some protrusion part 5, each protrusion part 5 may be the same shape, and a different shape may be sufficient as it.

  The grooves 8a and 8b of the frame 7 are provided between the one raised portion 7a and 7b and the portion of the frame 7 that is not the raised portion, in addition to being provided between the two raised portions 7a and 7b. May be.

In the second embodiment described above, the length L of the protruding portion 5 is formed to be larger than the depth D _ep of the corresponding groove 8a that fits into the protruding portion 5 in the frame 7, thereby making the thermal expansion fireproof. The main body portion of the material 1 and the frame body 7 are separated from each other. However, in the present invention, the main body portion of the thermally expandable refractory material 1 and the frame body 7 can be separated from each other. Not.

(Third embodiment)
Next, a thermally expandable refractory material according to a third embodiment of the present invention will be described with reference to FIG. In order to simplify the description, description of the same member numbers as those in the first embodiment and the second embodiment will be omitted.

As shown in FIG. 8, the thermally expandable refractory material 1 arranged in the joinery frame includes a thermally expandable layer 2 and a non-expandable layer 3 containing thermally expandable graphite laminated on each other, and the thermally expandable layer. The coating layer 4 is laminated on the surface opposite to the non-intumescent layer 3 in FIG. The heat-expandable layer 2, the non-expandable layer 3 and the coating layer 4 are integrally formed into a sheet shape. The non-expandable layer 3 protrudes from a surface (a wide surface extending in the longitudinal direction of the thermally expandable layer 2) on which the thermally expandable layer 2 is provided (a side surface in the width direction of the non-expandable layer 3 in the drawing). part 5 is provided, each projection 5 and the base 5a that protrudes from the non-intumescent layer 3, and a distal end side of the distal end portion 5b than the base portion 5a, a maximum width W ₂ of the end portion 5b in the present embodiment the base It is larger than the maximum width W _{1 of} 5a. The shape of the distal end portion 5b is not particularly limited, but for example, as shown in the figure, it may take a shape that has a substantially triangular cross section and tapers toward the distal end.

  The frame 7 of the joinery has a pair of raised portions 7a and 7b in a rail state, and the two protruding portions 5a extending from the side surfaces in the width direction of the non-expandable layer 3 are provided on the raised portions 7a and 7b of the frame 7, respectively. The grooves 8a and 8b are respectively fitted.

  The heat-expandable refractory material 1 may be pressed into the frame body 7 by applying pressure from above so that the protruding portion 5 fits into the grooves 8a and 8b, or the protruding portion from the end of the frame body 7 5 may be inserted and fitted along the longitudinal direction of the groove. A space 8c is formed between the thermally expandable refractory material 1, the raised portion 7a, and the raised portion 7b, and the portion of the thermally expandable refractory material 1 that contacts the space 8c is in contact with the thermally expandable refractory material 1 and the frame body 7. Is prevented.

  The materials constituting the expandable layer 2 and the covering layer 4, the materials constituting the base portion 5a and the tip portion 5b, and the dimensions thereof are as described in the first embodiment.

  The heat-expandable refractory material 1 of the third embodiment can be manufactured by coextrusion molding or the like in the same manner as described for the heat-expandable refractory material 1 of the first embodiment.

  According to the configuration of the third embodiment, the heat-expandable refractory material 1 is in contact with the frame body 7 and the non-expandable layer 3 (specifically, a part of the main body of the non-expandable layer 3 and the protruding portion 5). The heat-expandable layer 2 is separated from the frame body 7 via the non-expandable layer 3 in a direction substantially perpendicular to the direction (horizontal direction in the drawing) supported by the protrusions 5. Do not touch. For this reason, it can prevent that the acid in the thermally expansible layer 2 transfers to the frame 7, and corrodes the metal of the frame 7.

  The heat-expandable refractory material 1 of the third embodiment is not limited to the configuration described above, and can be modified as follows.

  Similarly to the case shown in FIG. 3, the heat-expandable refractory material 1 may be composed of a heat-expandable layer 2 and a non-expandable layer 3 containing heat-expandable graphite, and the covering layer 4 may be omitted.

  Similarly to the case shown in FIG. 4, the length of the protruding portion 5 may be larger than the depth of the corresponding groove 8 a that fits with the protruding portion 5 in the frame body 7. In this case, the side surface of the thermally expandable layer 2 can be prevented from coming into contact with the frame body 7.

  Similarly to the case shown in FIG. 5, the heat-expandable refractory material 1 may be composed of a heat-expandable layer 2 containing heat-expandable graphite, and the coating layer 4 may be omitted.

The shape of the protrusion 5 is not limited, and may be a substantially circular cross section, a substantially elliptical shape, a substantially rectangular shape, or the like. The maximum width W ₂ of the tip portion 5b may be smaller than or equal to the maximum width W ₁ of the base portion 5a.

The number of the protrusions 5 is not limited, and may be one or may be three, four, five, or the like. Moreover, when providing the some protrusion part 5, each protrusion part 5 may be the same shape, and a different shape may be sufficient as it.

(Fourth embodiment)
Next, a thermally expandable refractory material according to a fourth embodiment of the present invention will be described with reference to FIG. In order to simplify the description, description of the same member numbers as those in the first to third embodiments will be omitted.

  As shown in FIG. 9, the heat-expandable refractory material 1 arranged in the joinery frame includes a heat-expandable layer 2 and a non-expandable layer 3 containing heat-expandable graphite laminated on each other, and the heat-expandable layer. 2 and the non-expandable layer 3 are integrally formed in a sheet shape. A plurality (three in the figure) of protrusions 5 extend from the side of the non-expandable layer 3 on which the thermally expandable layer 2 is provided (a wide surface extending in the longitudinal direction of the thermally expandable layer 2). In the present embodiment, the projecting portion 5 includes two projecting portions 5 extending from both ends in the width direction of the non-expandable layer 3 and projecting portions 5 c extending away from the two projecting portions 5. Each of the parts 5 has a base part 5a protruding from the non-inflatable layer 3 and a tip part 5b on the tip side of the base part 5a. In this embodiment, the maximum width (length in the left-right direction in the figure) of the tip part 5b is It is larger than the maximum width (length in the left-right direction in the figure) of the base 5a.

A pair of opposed rail-like raised portions 7 a and 7 b extending along the longitudinal direction of the frame body 7 are provided at the upper end portion of the frame body 7. The raised portions 7a and 7b and the two protruding portions 5 have a substantially L-shaped cross section in the longitudinal direction of the thermally expandable refractory material 1, and the raised portions 7a and 7b engage with the two protruding portions 5, respectively. A groove between the two raised portions 7a and 7b of the frame body 7 is partitioned into a space 8d and a space 8e by a protruding portion 5c. Since the distance from the heat-expandable layer 2 to the frame 7 separating the spaces 8d and 8e is equal to or greater than the length of the raised portions 7a and 7b of the frame 7, the heat-expandable refractory material 1 (thermal expansion) The contact between the thermally expandable refractory material 1 (thermally expandable layer 2) and the frame body 7 is prevented at the portion in contact with the spaces 8d and 8e in the expandable layer 2).

  According to the configuration of the first embodiment, the heat-expandable refractory material 1 is in contact with the frame body 7 at the non-expandable layer 3 (specifically, the protruding portion 5 of the non-expandable layer 3). Layer 2 is spaced from frame 7 and is not in direct contact with frame 7. For this reason, it can prevent that the acid in the thermally expansible layer 2 transfers to the frame 7, and corrodes the metal of the frame 7.

  The heat-expandable refractory material 1 of the fourth embodiment is not limited to the configuration described above, and can be modified as follows.

  A coating layer 4 may be further laminated on the surface of the non-expandable layer 3 opposite to the thermally expandable layer 2.

  The shape of the protrusion 5 is not limited, and may be a substantially circular cross section, a substantially elliptical shape, a substantially rectangular shape, or the like.

The number of the protrusions 5 is not limited, and may be one, or may be two, four, five, or the like. Moreover, when providing the some protrusion part 5, each protrusion part 5 may be the same shape, and a different shape may be sufficient as it.

There may be one projecting part 5 other than two, which has a base part 5a and a tip part 5b on the tip side of the base part 5a, and the maximum width of the tip part 5b is larger than the maximum width of the base part 5a. And three or more. For example, the number of the protrusions 5 may be one, and the width of the other one or the plurality of protrusions 5 may be substantially constant over the entire length.

In FIG. 9, the protrusion 5 extends substantially perpendicularly from the surface of the non-expandable layer 3 provided with the thermally expandable layer 2, but is inclined from the surface of the non-expandable layer 3 provided with the thermally expandable layer 2. It may extend.

Two or more protrusions 5c may be provided or may be omitted.
(Frame and joinery)
Next, the heat-expandable refractory material 1 of the first embodiment, the heat-expandable refractory material 1 of the second embodiment, the heat-expandable refractory material 1 of the third embodiment, or those included in the scope of the present invention A frame and joinery to which the thermally expandable refractory material 1 as another example of the embodiment is applied will be described.

  FIG. 10 is a front view of the sliding window sash 50 according to the present embodiment, and FIG. 11 is a cross-sectional view of a main part taken along the line AA of FIG. 10 and 11, the sash 50 is fixed to a rectangular opening formed in a structure such as a house, and has a rectangular opening frame 10 having an opening on the outer periphery and a horizontal inside thereof. Two sliding shojis 20 that are movable in the direction are provided.

  The opening frame 10 as a joinery frame is composed of left and right vertical frame members 11 and 12 and upper and lower horizontal frame members 13 and 14, and the inside surrounded by the frame members 11 to 14 is an opening. . The two shojis 20 serving as the joinery frame close the opening and have substantially the same structure. From the left and right vertical members 21, 22 and the upper and lower horizontal members 23, 24, It is formed in a rectangular shape, and the vertical gutters on the center side overlap each other to form a summing part. The opening frame 10 and the shojis 20 and 20 are configured by combining vertical and horizontal frame members 11 to 14 and vertical and horizontal frame members 21 to 24, respectively.

  As described above, the sash 50 is configured such that the two shojis 20 are slidably supported by the opening frame 10, and the vertical and horizontal collars 21 to 24 constituting the outer frame of the shoji 20 are provided inside. A window glass 25 made of iron netted glass is supported. The window glass 25 constitutes a fire-resistant plate, and constitutes a partition surface that partitions the sash 50 from the outside to the inside. In addition, as a fireproof board | plate material, not only the window glass which has translucency but what has light-shielding property like a metal plate material and a silicate board may be used.

The configuration of the sash 50 is not particularly limited, and the upper, lower, left, and right frame members 11 to 14 and the eaves members 21 to 24 that form the sash have cavities extending along the longitudinal direction, and are orthogonal to the longitudinal direction. Any known shape may be used as long as the shape of the cross-sectional surface has one or a plurality of hollow spaces. Moreover, although the material used for each frame material and each brazing material constituting the sash may be formed from any material such as metal, resin, wood, or a composite material thereof, it is preferably made of metal.

  The vertical frame members 11 and 12 constituting the opening frame body 10 include cavities 11a and 12a extending through the vertical frame members 11 and 12 in the longitudinal direction, respectively. Further, the horizontal frame members 13 and 14 constituting the opening frame body 10 are also provided with cavities extending through the horizontal frame members 13 and 14 in the longitudinal direction, though not shown.

  The left and right vertical scissors 21 and 22 constituting the shoji 20 are respectively provided with cavities 21a and 22a extending through in the longitudinal direction. Further, the reed members 23 and 24 constituting the shoji 20 are also provided with cavities extending in the longitudinal direction in the same manner, although not shown. And the window glass 25 which consists of iron netted glass is engage | inserted by the internal space of the vertical and horizontal brazing material. The window glass 25 is located at a stepped portion of the vertical gutters 21 and 22 and is fixed by a rubber sealant or a sealing agent 26.

  The thermally expandable refractory material 1 is inserted into the cavities of the frame members 11 to 14 and the saddle members 21 to 24 constituting the opening frame 10 and the shoji 20 of the sash 50. Each frame member 11-14 and each rib member 21-24 include two raised portions 7a or between two raised portions 7b or one raised portion 7c and each frame member 11-14, and each rib member 21-21. A groove 8 is provided between the groove 24 and the protrusion 5 of the thermally expandable refractory material 1 is fitted into the groove 8.

  Further, the thermally expandable refractory material 1 is also inserted into the cavities 21 a and 22 a of the vertical fences 21 and 22 of the shoji 20. The heat-expandable refractory material 1 has a flat plate shape except for the protrusions 5 and is inserted in contact with the wall surfaces parallel to the hollow glass surface. Further, although not shown, the thermally expandable refractory material 1 is inserted into a cavity extending through the longitudinal direction in the upper and lower reed members 23 and 24 of the shoji 20 as well.

  When a fire occurs on the indoor side or the outdoor side of the sash 50, the heat-expandable refractory material 1 in which the heat of the fire is inserted in the cavities of the frame members 11 to 14 and the saddle members 21 to 24 of the sash 50 is provided. Heated. The heat-expandable refractory material 1 expands quickly and exhibits fireproof performance quickly.

  12 and 13 show a second embodiment in which the present invention is embodied in a fire door. FIG. 12 is a schematic view showing an example of the fire door 52, and FIG. 13 is a vertical sectional view of an essential part taken along line BB in FIG. In FIG. 12, description of parts other than those necessary for the description of the present invention is omitted.

  In FIG. 12, the fire door 52 includes a rectangular frame 30 as an opening frame having an opening, and a door 40 rotating inside via a hinge 35. The door portion 40 includes frame members 41 to 44 as outer frame bodies that are joinery frames, a door body 45 whose outer periphery is supported by the frame members 41 to 44, and a handle 46. The material used for each of the frame members 41 to 44 may be formed from any material such as metal, resin, wood, or a composite material thereof, but is preferably made of metal.

  The door body 45 is usually formed of glass, wood, metal, resin, or the like, and constitutes a fire-resistant plate material.

  The frame body 30 as a joinery frame body is composed of left and right vertical frame members 31 and 32 and upper and lower horizontal frame members 33 and 34, and the inside surrounded by the frame members 31 to 34 is an opening. The material used for the frame members 31 to 34 may be formed from any material such as metal, resin, wood, or a composite material thereof, but is preferably made of metal.

  Referring to FIG. 12, the thermally expandable refractory material 1 is disposed along the longitudinal direction of the frame members 31, 32, 33, 34 on each of the frame members 31, 32, 33, 34 of the frame body 30. Each of the frame members 41, 42, 43, 44 of the door portion 40 is also provided with the heat-expandable refractory material 1 along the longitudinal direction of the frame members 41, 42, 43, 44. In frame materials 31 to 34 and 41 to 44 which are door sashes. The arrangement of the thermally expandable refractory material 1 is as described in the embodiment of the window sash.

  When a fire occurs on the indoor side or the outdoor side of the fire door 52, it is inserted into the frame members 31, 32, 33, 34 of the frame body 30 of the fire door 52 and the frame members 41 to 44 of the door portion 40 by the heat of the fire. The made thermally expandable refractory material 1 is heated. The heat-expandable refractory material 1 expands quickly and exhibits fireproof performance quickly.

  In addition, in this figure, although the thermally expansible fireproof material 1 is provided in both the frame 30 and the door part 40, you may provide in either one.

  In FIG. 13, the protruding portion 5 of the thermally expandable refractory material 1 is fitted in each of the grooves 8 of the frames 31, 32, 41, 42.

  As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, Various deformation | transformation based on the technical idea of this invention is possible.

  The present invention can also employ the following configurations.

[Item 1] A joinery frame, wherein the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove of the frame,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, and a non-expandable layer provided on one surface side of the thermally expandable layer,
A protrusion is provided on the surface opposite to the surface on which the thermally expandable layer is provided in the non-expandable layer or a substantially vertical surface, and the protrusion is fitted in the groove of the frame. A joinery frame featured.

[Item 2] A joinery frame, wherein the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove of the frame,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, the thermally expandable refractory material is provided with a protruding portion, the protruding portion is formed in the groove of the frame body, and the thermally expanded layer and A fitting frame that is fitted so as to be separated from the frame.

  [Item 3] The heat-expandable refractory material includes a non-expandable layer, and the protrusion is provided on a surface of the non-expandable layer opposite to the surface on which the heat-expandable layer is provided. The joinery frame described in 1.

[Item 4] A joinery frame, wherein the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted into the groove,
The heat-expandable refractory material includes a heat-expandable layer containing heat-expandable graphite, a protrusion is provided on a side surface in the width direction of the heat-expandable layer, and the protrusion is fitted in a groove of the frame body. A joinery frame characterized by

[Item 5] A joinery frame, wherein the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted into the groove,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, and a non-expandable layer.
The non-expandable layer is provided with a protrusion that protrudes toward the thermally expandable layer, and the protrusion is fitted in a groove of the frame so that the thermally expandable layer and the frame are separated from each other. A joinery frame characterized by that.

  [Claim 6] The joinery frame according to any one of [Claim 1] to [Claim 5], wherein the thermally expandable refractory material includes a coating layer.

  [Item 7] A fitting having an opening frame having an opening, a plate member that closes the opening of the opening frame, and an outer frame that supports the outer periphery of the plate, the opening frame and the outer frame At least one of the bodies comprises the joinery frame according to any one of [Item 1] to [Item 6].

  [Section 8] The joinery according to [Section 7], which is a window or a door.

  [Item 9] A thermally expandable layer containing thermally expandable graphite and a non-expandable layer provided on one surface side of the thermally expandable layer, wherein the thermally expandable layer in the non-expandable layer is provided. A heat-expandable refractory material, characterized in that a protrusion is provided on a surface opposite to or substantially perpendicular to the surface.

[Item 10] A thermally expandable refractory material for fitting into a frame provided with a groove,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, the thermally expandable refractory material is provided with a protrusion, and the length of the protrusion is in the groove of the frame body. A thermally expandable refractory material having a length that separates the thermal expansion layer and the frame body when the expandable refractory material is fitted.

  [Item 11] A thermally expandable layer containing thermally expandable graphite and a non-expandable layer provided on one surface side of the thermally expandable layer, the non-expandable layer on the thermally expandable layer side A heat-expandable refractory material characterized in that a protruding portion is provided.

  [Item 12] The thermally expandable refractory material according to any one of [Item 9] to [Item 11], wherein the thermally expandable refractory material includes a coating layer.

[Item 13] A heat-expandable refractory material,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, and the thermally expandable layer has a base portion protruding from the thermally expandable layer, and a distal end portion on the distal end side than the base portion, A thermally expandable refractory material characterized in that the maximum width of the tip is larger than the maximum width of the base.

Claims (13)

It is a joinery frame, and the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove of the frame,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, and a non-expandable layer provided on one surface side of the thermally expandable layer,
A protrusion is provided on the surface opposite to the surface on which the thermally expandable layer is provided in the non-expandable layer or a substantially vertical surface, and the protrusion is fitted in the groove of the frame. A joinery frame featured. It is a joinery frame, and the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove of the frame,
The thermally expandable refractory material includes a non-expandable layer and a thermally expandable layer containing thermally expandable graphite, and the thermally expandable refractory material is provided with a protrusion,
The protrusion is provided on a surface of the non-expandable layer opposite to the surface on which the thermally expandable layer is provided;
Fittings frame, wherein the protrusion into the groove of the frame body, the frame and body and the heat-expandable layer is fitted so as to be separated. It is a joinery frame, and the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove,
The thermally expandable refractory material includes a flat plate-like thermally expandable layer containing thermally expandable graphite, and a protruding portion that protrudes outward from the side surface is provided on a side surface in the width direction of the thermally expandable layer. The joinery frame characterized in that the protrusion is fitted in a groove of the frame. It is a joinery frame, and the joinery frame includes a frame provided with a groove, and a thermally expandable refractory material fitted in the groove,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite, and a non-expandable layer.
Non-intumescent layer protrusion protruding to the heat-expandable layer side is provided in the the protrusion groove of the frame, fitted as the frame and body and the heat-expandable layer is separated A joinery frame, characterized by being.   The joinery frame according to any one of claims 1 to 4, wherein the thermally expandable refractory material includes a coating layer.   An opening frame having an opening, a plate member that closes the opening of the opening frame, and an outer peripheral frame that supports the outer periphery of the plate. At least one is provided with the fitting frame as described in any one of Claims 1-5, The fitting characterized by the above-mentioned.   The joinery according to claim 6 which is a window or a door. It is a thermally expandable refractory material for fitting to a frame provided with a groove,
A heat-expandable layer containing heat-expandable graphite; and a non-expandable layer provided on one side of the heat-expandable layer, opposite to the surface of the non-expandable layer provided with the heat-expandable layer Projections are provided on the side surface or the substantially vertical surface,
The projecting portion is provided with a fitting portion for fitting into the groove. It is a thermally expandable refractory material for fitting to a frame provided with a groove,
The thermally expandable refractory material includes a thermally expandable layer containing thermally expandable graphite,
The heat-expandable refractory material is provided with a plurality of protrusions formed of the same material as the heat-expandable layer, and the protrusion includes a base protruding from the heat-expandable layer, and a distal end side of the base. A distal end portion, the maximum width of the distal end portion is larger than the maximum width of the base portion,
The length of the projecting portion, when mated with said thermally expandable fireproof material in the groove of the frame, characterized in that said intumescent layer is the length of separating said frame body Thermally expandable refractory material. It is a thermally expandable refractory material for fitting to a frame provided with a groove,
The heat-expandable refractory material includes a heat-expandable layer containing heat-expandable graphite and a non-expandable layer provided on one surface side of the heat-expandable layer, and the non-expandable layer has the heat-expandable layer. Protruding part protruding to the sex layer side is provided,
The projecting portion is provided with a fitting portion for fitting into the groove. It is a thermally expandable refractory material for fitting to a frame provided with a groove,
The thermally expandable refractory material includes a flat plate-like thermally expandable layer containing thermally expandable graphite, and a protruding portion that protrudes outward from the side surface is provided on a side surface in the width direction of the thermally expandable layer. ,
The projecting portion is provided with a fitting portion for fitting into the groove. It is a thermally expandable refractory material for fitting to a frame provided with a groove,
A heat-expandable layer containing heat-expandable graphite, and a non-expandable layer provided on one surface side of the heat-expandable layer, and a side surface in the width direction of the non-expandable layer is outward from the side surface. Is provided with a protruding part ,
The projecting portion is provided with a fitting portion for fitting into the groove. The thermally expandable refractory material according to any one of claims 8 to 12, wherein the thermally expandable refractory material includes a coating layer.

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